export default {
  namespaced: true,
      // 购物车的数组，用来存储购物车中每个商品的信息对象
      // 每个商品的信息对象，都包含如下 6 个属性：
      // { goods_id, goods_name, goods_price, goods_count, goods_small_logo, goods_state }
  state: () => ({
    cart: JSON.parse(uni.getStorageSync('cart') || '[]')
  }),
  // 模块的 mutations 方法
  mutations: {
    updateAllGoodsState(state,newVal){
      state.cart.forEach(x => x.goods_state = newVal)
      this.commit('my_cart/saveToStorage')
    },
    removeGoodsById(state,goods_id){
      state.cart = state.cart.filter(x => x.goods_id !==goods_id)
      this.commit('my_cart/saveToStorage')
    },
    updateGoodsCount(state,goods){
      const res = state.cart.find(x => x.goods_id === goods.goods_id)
      if (res) {
        res.goods_count = goods.goods_count
      }
      this.commit('my_cart/saveToStorage')
    },
    updateGoodsState(state, goods) {
      const res = state.cart.find(x => x.goods_id ===goods.goods_id)
      if (res) {
        res.goods_state = goods.goods_state
        this.commit ('my_cart/saveToStorage')
      }
    },
    saveToStorage(state) {
      uni.setStorageSync('cart',JSON.stringify(state.cart))
    },
    addToCart(state, goods) {
      // 根据提交的商品的Id，查询购物车中是否存在这件商品
      // 如果不存在，则 findResult 为 undefined；否则，为查找到的商品信息对象
      const findResult = state.cart.find((x) => x.goods_id === goods.goods_id)
      // console.log(findResult)
      if (!findResult) {
        // 如果购物车中没有这件商品，则直接 push
        state.cart.push(goods)
      } else {
        // 如果购物车中有这件商品，则只更新数量即可
        findResult.goods_count++
      }
      this.commit('my_cart/saveToStorage')
      // console.log(state.cart)
    },
  },
  getters: {
    checkedGoodsAmount(state) {
     return state.cart.filter(x => x.goods_state).reduce((total,item) => total += item.goods_count * item.goods_price,0)
    }
    ,
    total(state){
      // let c = 0
      // // state.cart.forEach(goods => c += goods.goods_count)
      // state.cart.find(x => c+=x.goods_count)
      // return c
     return state.cart.reduce((total,item) => {return total += item.goods_count},0)
    }
    ,
    checkdCount(state){
     return state.cart.filter(x => x.goods_state).reduce((total,item) => total += item.goods_count,0)
    }
  },
}